N-disubstituted derivatives of alpha-amino acids

ABSTRACT

THIS DISCLOSURE CONCERNS DISUBSTITUTED A-AMINO ACIDS WHICH HAVE BOTH A PHENYL AND A BENZOYL SUBSTITUENT ON THE NITROGEN ATOM. THESE COMPOUNDS EXERT ANTI-INFLAMMATORY AND ANALGESIC EFFECTS IN MAN, AS EVIDENCED BY CLINICAL EVALUATION ACCORDING TO STANDARD TEST PROCEDURES.

US. Cl. 260 471 A j N-DISUBSTITUTED DERIVATIVES F a-AMINO ACIDS Francois Robert Bertrand, Geneva, Switzerland, assignor to Medial de Toledo & Cie, Geneva, Switzerland No Drawing. Filed Apr. 3, 1968, Ser. No. 718,361

Claims priority, application France, Apr. 11, 1967,

1m. (:1. min 103/22 11 Claims ABSTRACT OF THE DISCLOSURE This disclosure concerns disubstituted a-amino acids which have both a phenyl and a benzoyl substituent on the nitrogen'at'om. These compounds exert anti-inflammatory and analgesic elfects in man, as evidenced by clinical evaluation according to standard test procedures.

This invention relates to compositions of matter elassicfied in organic chemistry as N-disubstituted-a-amino acids, and to processes for making and using such compositions. W H

There are already known several processes for preparing N-disubstituted a-amino acids. Some of these derivatives which have interesting biological properties have on the amino group substituted phenyl or substituted benzoyl groups but not both as the presence of both was thought to sterically hinder the molecule. The discovery of the syntheses of the present invention has led to the preparation of' novel compounds having unexpected activity. .The invention in its composition aspect resides in the concept of a chemical compound having a molecular structure in which there is attached to the nitrogen atom of a a-amino acid both a substituted phenyl and a substituted benzoyl radical According to the preferred embodiments of the present invention these compounds can bedefined by the following formula: 1

wherein I X R is hydrogen, alkyl, aryl, alkylaryl, cycloalky or heterocyclic, substitute or unsubstituted; carboxylic group, salified or esterified;

R is OH, O-alkyl, O-aryl, O-alkylaryl, O cycloalkyl,

heterocyclic, substituted or unsubstituted; amino, substituted or unsubstituted; an alkali metal or an alkali earth metal salt of the corresponding acid;

X-Y can be the same or different, and are hydrogen,

hydroxy, alkyl, aryl, alkoxy, halogen, amono, nitro, sulfo,

--Ohexyl, morpholyl, amino, diniethylamiuo, diethylamino.

3,763,216 Patentedsocte 2, 1,973

. 'Several'synthesis are available for the preparation of the present compounds. These can be summarized as follows:

The compounds can be prepared by pound of the formula:

by benzoylation where B is -CHCOR:

reacting a comand by N-alkylation where B is i x Q,

where R R X and Y are as above defined and also the formula:

i by degradation where A is with Z representing a halogen or polyhalogen, quartenary ammonium, aryl or alkylsulfone -SO -R, sulfonic group or nitro; and by oxidative or thermal degradation where A is Q being COOR, CONT-I CON CN and R being H or alkyl. In the ,above alkaline synthesis benzoylation'can be effected by the chlorides, the anhydrides, the mixed anhydrides or the methyl or ethyl esters of a R-benzoic acid reacting with N--(R-phenyl) of a-amino acid derivatives (glycine, alanine, phenylalanine, etc.) or with their ethyl or methyl esters. V f V Similarly benzoylation can take place by means of a free R-benzoic acid with derivatives of N-(R-phenyl)- amino acids, or of its esters, in the presence of a catalyst (for example BF, or p-toluenesulfonic acid).

The synthesis can also take place by means of the substitution of N-(R-phenyl)-N-(amino-benz0yl)amino acids or their esters into N-(R-phenyl)-N-(R-benzoyl) a-amino acids or their esters.

Similarly the synthesis can take place by the N-alkylation of substituted or unsubstituted N-(R-benzoyl) ahilines by'rneaiis of haloacetic acid methyl or ethyl CH3; C H 1" 3 a R f- 011; 'ONa; 0011 00,11

(2) Substitutions of p-aminobenzamides into p-chlorobenzamides.

- 40 1 R-O-Q-JTI-(LH-CO-Ra 0:0

NH, t

R-O-QN-CH-CO-Ra (3) N-alkylation of (p-alkoxyphenyl) p'-ch1orobenzamides.-

l (4 O-alkylation or subs esters 01;.of.similarshalopropionic.esters inithe presence of--: ,1

or I 7 R1 R O -QIJ-GIL-o 0- 3:

c1 (5) S'aponification" and 'decarboxylation of N- (p-alk'- oxyphenyl)-N-p-(chlorobenzoyl) amino malonic acid and esters.

collar,- 0 02m m i i i P (7) Degradation of methylketones: f3- f" 'f NEOH 2301 0213- N-CH -CO-CH; Br; 4 NBOH ootNa'oo 5 I CHa-OQN-GlIz-C 011% CHBr 3NaBr 3Hz0 2NaCl 02115011 002 2(5s.4s 40. 07 44.01 1101 (6) Oxidative or thermal degradation of lactic and pyruvic acids by heating or by oxidation yvith hydrogen peroxide, lead tetra-acetate or dilute sulfuric acid. l 0

CH OQ-fii-Cm-GO-OOQM %o2 H20 CO This applies to the following structures: X R

375.80 01 10.00 18.02 IIICHCOCHzZ Y CO R=a1kyl, H Y, X are a halogen 01 Z is 319.75 7 44.01 a 40.07 a halogen or polyhalide a quaternary ammonium an aryl or alkyl sulfone -SO R sulfuric or nitro group 8) Saponification of acetonitriles:

This degradation applies to'the following structures, the vertical dotted lines showing the cleavage points:

H I I R H NflzSzOs H10 2 NaHSO;

C O-C Where R= 2 or alkyl H 190.10 a 18.02 2 (104.06)

. NaHSO; 110110 CH OH-SO Na J: I 104. 06 30. 03 134. 09 Y 3 V 0:0 -CHOHCONH1- y V 239.23 12.02

- -CHOHCON3 V X CH30-NH-.CH7-SQ:1I la -|vnorm-H10 l l 239.23 r 1-05.12 18.02 i

v I Y g I 7 CH -OQ-NH-CH -ON+NaHSO3+KOH and to the ether. and alcohol and derivatives thereof: 7 102.20 l 10406 as. 11

p .28 I V cH;-o@- H-cn1-c1-i+ (Jr-0001 O-R O-R 2.102.20 175.01

- The benzoylationcan also take cna-o i i-orn-oN cm-o mat-on, I 1:0 -HC1 ON H01 CHa-IFCHz-CN m0 0 7 (NaOH (HCl Qm-oQA I-CHZ-OOZH C=O l (9) Degradation of oo-om N ('311 00 Et NaOH on o Q 2 1 CHPO-Q-n-Gm-C 02H Generally, benzoylation of N-(p-alkoxyphenyl)glycines and alanines is carried out by dissolving them in an aqueous solution of sodium hydroxide and adding to the mixture a R-benzoic acid chloride and acidifying .to obtain the corresponding benzamide which is-filtered, washed, dried, and dissolved in ether before, recrystallization in absolute ethanol.

place in toluene with the formation of the a-amino acid chlorhydrate which is separated from the benzamide and recrystallized in tolu- ,ene or in a toluene-.benzine mixture.

The N-alkylation of (p-alkoxyphenyl) p-chl'orobenzamides is carried out by adding these compounds to a solution of sodium ethylate in toluene followed by refluxing the mixture, distilling at ordinary pressure to eliminate the alcohol freed by the reaction. The insoluble sodium derivative is then alkylated with the'desired haloalkyl ester and the residue of this alkylation is recrystallized in benzene-toluene.

The best mode contemplated by the inventor of carrying out his invention will now be set forth as follows:

(A) Benzoylation of N-(p-alkoxyphenyl)-glycines and alanines or of their esters Example 1.-123.2 gr. of p-anisidine, 108 gr. of water, 123 gr. of anhydrous sodium acetate are mixed and heated with stirring at 50 C. There is added portionwise in /2 hour 94.5 gr. of chloracetic acid and the mixture is kept for one hour at -98 C. The reaction mass is dissolved in 1680 gr. of 5% sodium hydroxide then 30 gr. of p-anisidine unreacted are extracted with ether. From the basic solution acidified with 600 gr, of 25% HCl there is extracted with ether 30 gr. of N-(p-methoxyphenyl)- imino-diacetic acid melting at 122-3" C. V

After treating with concentrated 35% NaOH to a pH of 3.5, 60 gr. of N-(p-methoxyphenyl)-glycine crystallize having a melting point of 142-3" C..

181.2 gr. of the above compound have dissolved in 600 gr. of Water together with 1200 g'r. of 10% NaOH. There is added at 20 192.5 gr. of p-chlorobenzoic chloride over a half hour period and the mixture is stirred for 3 hours. After acidifying to a pH of 2 there is obtained 318.5 gr. of p-chlorobenzamide which is insoluble in water. The product is filtered, washed and dried. It is then mixed in ether and recrystallized in absolute ethanol. There is obtained then 196 gr. of N-(p-methoxyphenyl)-N-(p-chlorobenzoyl)-glycine melting at 191-2 C.

Empirical formula: C H ClNO (lvIW 319.75); Calculated (percent): C, 60.10; H, 4.41; CI, 11.09; N, 4.38. Found (percent): C, 59.85;--H,-..4.38; Cl, 10.94; N,4.45.- 1

Empirical formula: C17H16CINO4 (MW 333.78); Calcu= lated (percent): C, 61.17; H, 4..83; Cl, 10.62; N, 4.20. Found (percent): C, 61.26; H, 4.69; CI, 10.43; N, 4.26.

Example 3.123.2 g. of p anisidine, 108 g. of water, 123 g. of anhydrous sodium acetate are heated with stirring at 50 C. In 1% hour were introduced 108 g. of a-chloropropionic acid. The mixture was heated at 95.8 for an hour then the reaction mass was dissolved in 1680 g. of 5% NaOH. 30 g. of unreacted p anisidine were extracted with ether. The solution was acidified with 600 g. of 25 HCl. The extraction was repeated with ether and then there was precipitated at a pH of 3.5 with 35% concentrated NaOH 130 g. of N-(p-methoxypheny1)- alanine melting at 176-8 C. Y

195.2 g. of the above compound were heated with stirring in 2 litres of toluene at 75-180 C. In /2 hour there was introduced 87.5 g. of p-chlorobenzoic acid chloride diluted with ml. of toluene. The reaction was allowed to proceed for 7 hours at 80 .C.- There formed an abundant precipitate which was :filtered and dried. The chlorhydrate of N-(p-methoxyphenyD-alanine was mixed with 730 g. of 5% HCl. The insoluble p-chlorobenzamide was filtered, washed, tallized in toluene.

There was thus obtained 114g. of N-(p-methoxyphenyl)-N-(p-chlorobenzoyl)-alanine, melting at 154-6.

Empirical formula: C17H15clNO4 (MW 333.78):

Calculated (percent): C,. 61.17; H, 4.83; CI, 10,62;

N, 4.20. Found (percent): C,-61.01; H, 4.75; Cl, 10.58; N,

Example 4.Under the same conditions 137.2 g. of pphenetidine gave 140 g. of N(p-ethoxyphenyl)-alanine melting at 178-180" C.

209.2 g. of N-(p-ethoxyphenyl)-alanine are benzoylated in toluene at 75-80" with 87.5 g. p-chlorobenzoic acid chloride. Only the chlorhydrate of the secondary amine crystallizes. It is filtered and then the p-chlorobenzamide is extracted with 800 g. of NaOH. There forms an emulsion which is broken with ether. The basic solution is neutralized to pH 3.5 with concentrated HCl at 25% to precipitate 145 g. of unpurified p-chlorobenzamide. The product is crystallized in a mixture of toluene-benzine at 50%. There is obtained 118 g. of N-(p-ethoxyphenyl)-N- (p-chlorobenzoyl)-alanine melting at 123-5 C.

Empirical formula: C H ClNO (M=347.80):

Calculated (percent): C, 62.17; H, 5.22; Cl, 10.20;

N, 4.03. Found (percent): C, 62.08; H, 5.18; Cl, 10.02, N,

Example 5.123.2 g. of p-anisidine, 82 g. of anhydrous sodium acetate, 54 g. of water, 100 ml. of ethanol are heated with stirring at 50 C. There is slowly introduced in 1% hours 122.6 g. of ethyl chloracetateand the mixture is refluxed for 5 hours. The reaction mass is dissolved in 1460 g. of 5% HCl and the iminodiacetic derivative is extracted with ether then neutralized at a pH of 6.6 with 35% NaOH in the presence ofether. The ethereal solution is decanted and distilled to dryness under vacuum. The crystalline residue weighs 180 g. The residue is distilled under vacuum of 1 mm. Hg. There is obtained g. of anisidine E =90 nontransformed, then 150 g. E 155 of N-(p-methoxyphenyl)-glycine ethylester melting at 54-56.

209.2 g. of N-(p-methoxyphenyD-glycine ethylester, 87 g. of pyridine, 1250 m1. of toluene are mixed at There is introduced between 1520 in A of an hour with stirring a mixture of 178.5 g. of p-chlorobenzoic acid chloride and 250 ml. of toluene. The p-chlorobenzamide is recrystallized in benzine containing 10% of toluene. There is thus obtained 307 g. of N-(p-methoxyphenyl)-N-(p chlorobenzoyl)-glycine ethylester melting at 67-68. I

209.2 g. of N-(p-methoxyphenyl)-glycine ethylester, 295.1 g. of p-chlorobenzoic acid anhydride, and 2 litres of toluene are refluxed for 4 hours with stirring. After cooling, the crystallized p chlorobenzoic acid is filtered and then the solution is successively extracted with 5% sodium carbonate, then 5% H01. After concentration under vacuum of the toluene, there is obtained 320 g. of N-(p-methoxyphenyl):N-(p-chlorobenzoyl)-glycine ethyl ester which are recrystallized in benzine containing 10% of toluene melting at 67-68.

Empirical formula; C gH ClNQ, ('M=347.80):

Calculated (percent): C, 62.17; H, 5.22; Cl, 10.20;

N, 4.03. Found (percent) Examplei6.Under the same conditions 137.2 g. of p-phenetidine yield 160 g. of N-(p-ethoxyphenyl)-glycine ethylester melting at 423 C. By benzoylating 223.3 g. of N-(p-ethoxyphenyl)-glycine ethylester with 178.5 g. of p-chlorobenzoic acid chloride in the presence of pyriand dried. It was recrys- C, 61.98;:1-1, 5.12; Cl, 10.11; N,

Empirical formula: C H ClNO (M=361.80):

Calculated (percent): C, 63.08; H, 5.57; Cl, 9.80; N,

Found (percent): c, 62.97; H, 5.48; or, 9.69; N,

Example 7.-In the same manner 123.2 g. of p-anisidine, 82 g. of anhydrous sodium acetate, 54 g. of water, ml. of ethanol are heated with stirring at 50. There is introduced in 1% hours 136.6 g. of u-ethyl chloropropionate with reflux for 5 hours. After dissolving the mass in 1460 g. of 5% HCl the impurities are extracted with ether. Neutralization to pH of 6.6 is carried out in the presence of ether and there is obtained after concentration 170 g. of crystalline residue. Distillation is carried out under vacuum at 1 mm. of mercury and there is obtained at 90 46.7 g. of unreacted p-anisidine, then 114.6 g. of N-(p-methoxyphenyl)-alanine ethylester at 131-3 C.

223.3 g. of the above product, 87 g. of pyridine, 1250 ml. of toluene are mixed at 15. There is introduced at between 1520 in of an hour with stirring a mixture of 178.5 g. of p-chlorobenzoic acid chloride :and 250 ml. of toluene. Stirring is continued for 3 hours at 20. The pyridine chlorhydrate is filtered and the toluene is concentrated under vacuum. There is obtained 350 g. of N- (p-methoxyphenyl)-N-p-chlorobenzoyl) alanine ethyl ester which is distilled under vacuum at 1 mm. of mercury E =205-8.

Empirical formula: C H ClNO (M==361.80):

Calculated (percent): C, 63.08; H, 5.57;C1, 9.80; N,

3.87. Found (percent): C, 63.11; H, 5.54; Cl, 9.71; N,

Example 8.Under the same conditions, 137.2 g. of p-phenetidine yield g. of N-(p-ethoxyphenyl)-alanine ethylester E =152-3, melting at 34-35 C.

By benzoylating 237.3 g. of N-(p-ethoxyphenyl)-alanine ethyl ester with 178.5 g. of p-chlorobenzoic acid chloride in the presence of pyridine in toluene there is obtained 224 g. of N-(p-ethoxyphenyD-N-(p-chlorobenzoyD-alanine ethylester Empirical formula: C H ClNO (MW 375.83):

Calculated (percent): C, 63.92; H, 5.90; Cl, 9.41; N,

3.73. Found (percent): C, 63.81; H, 5.82; Cl, 9.50; N,

Example 9.347 g. of N-(p methoxyphenyl)-N- (pchlorobenzoyl)-glycine ethylester are refluxed with a mixture of 60 g. of NaOH, 60 g. of water and 480 g. of ethanol for 20 minutes. At the end of the saponification, there is added 600 g. of water to dissolve the sodium salt precipitate. There is filtered a light precipitate and acidification is carried out at pH 3.5 with 10% HCl. There is thus obtained 304 g. of N-(pmethoxyphenyl)-N-(p-chlorobenz0yl)-glycine which is recrystallized in ethanol and melts at 19l2 C.

Empirical formula: C H ClNO (MW=319.75):

Calculated (percent): C, 60.10; H, 4.41; Cl, 11.09;

N, 4.38. Found (percent): C, 59.85; H, 4.38; Cl, 10.94; N,

In the same manner it is possible to transform the above described products of Examples 6, 7 and 8 to the products described in the Examples 2, 3 and 4.

11 (B) Substitution of N-p-aminobenzamides into N-p-chlorobenzamides Example 10.108.7 g. of N-(p-methoxyphenyl) glycine and 750 ml. of toluene are heated to 75-80. There is introduced 55.7 g. of p-nitrobenzoic acid chloride dissolved in 150 ml. of toluene over /2 hour with stirring and the mixture is kept for 2 hours at 80. After crystallization, the mixture is filtered and the precipitate is dried. It is mixed in 440 g. of 2.5% HCl and. the insoluble pnitrobenzamide is recovered by filtration. There is obtained 97.8 g. of N-(p-methoxyphenyl)-N-(p-nitrobenzoyl) glycine melting at 1612.

Empirical formula: C H N O (MW 330.28):

Calculated (percent): C: 58.19, H: 4.27, N: 8.48 Found (percent): C: 58.02, H: 4.21, N: 8.42

33 g. of the above product are dissolved in 350 ml. of methanol. There is added 1 g. of palladium on activated charcoal then hydrogenation is carried out at room temperature under pressure of 1.2 atmospheres. The catalyst is filtered and the mixture is concentrated to dryness under vacuum. The residue is recrystallized in absolute ethanol. There is thus obtained 24 g. of N-(pmethoxyphenyl)-N-(p-amino'benzoyl) glycine melting at 173-4.

Empirical formula: C H N O (MW=300.27):

Calculated (percent): C: 64.00, H: 5.37, N: 9.33 Found (percent): C: 64.11, H: 5.28, N: 9.29

30 g. of the above product are dissolved in 65 ml. of 6 N HCl. Diazotization at 0 is carried out with 7.3 g. of sodium nitrite in solution in 25 ml. of water. 12.4 g. of freshly prepared cuprous chloride are dissolved in 100 ml. of 25% HCl at 30. There is slowly introduced with stirring a solution of diazonium salt in that of the cuprous chloride and the reaction is allowed to proceed for 1 hour at 30. The precipitate is filtered, washed and dried and recrystallized in ethanol. There is thus obtained g. of N (p-methoxyphenyl)-N-(p-chlorobenzoyl) glycine melting at 191-2.

In the same manner was prepared: N-(p-ethoxyphenyl)-N-(p-nitrobenzoyl) glycine melting at 181-2.

Empirical formula: C H N O (MW=344.31:

Calculated (percent): C: 59.30, H: 4.68, N: 8.14 Found (percent): C: 59.21, H: 4.62, N: 8.08

There was also prepared: N-(p-methoxyphenyl)-N-(pnitrobenzoyl) alanine melting at 130-2.

Empirical formula: c qHmNgog Calculated (percent): C: 59.30, H: 4.68, N: 8.14 Found (percent): C: 59.18, H: 4.59, N: 8.01

There is also prepared: N-(p-ethoxyphenyl)-N-(paminobenzoyl) alanine melting at'1778C.

Empirical formula: C H N O (MW=328.32):

Calculated (percent): 'C: 65.85, H: 6.14, N: 8.53 Found (percent): C: 65.86, H: 6.11, N: 8.56-

(C) N-alkylation of (p-alkoxyphenyl)-pchlorobenzamides v anisidine and 50 ml. of toluene, then the mixture is re- There was also prepared: N-(p-ethoxyphenyl)-N-(pnitrobenzoyl) alanine melting at 90-91".

Empirical formula: C H N O (MW 358.34):

Calculated (percent): C: 60.33, H: 5.06, N: 7.82 Found (percent): C: 60.21, H: 5.00, N: 7.79

Empirical formula: C H N 0 (MW 314.30):

Calculated (percent): C: 64.97, H: 5.77, N: 8.91 Found (percent): C: 64.86, H: 5.75, N: 8.84

There is also prepared: N-(umethoxyphenyl)-N-(paminobenzoyl) alanine melting at 198-9".

Empirical formula: C H N O (MW 314.30):

Calculated (percent): C: 64.97, H:'5.77, N: 8.91 Found (percent): C: 64.92, H: 5.72, N: 8.90

fluxed for /2 hour. There is distilled 100 ml. of toluene under ordinary pressure to eliminate the ethanol freed by the reaction. The insoluble sodium derivative is treated with 25.7 g. of ethyl chloroacetate, then the residue (62 g.) is recrystallized in benzine containing 10% of toluene. There is thus obtained N-(p-methoxyphenyl)-N-(pchlorobenzoyl) glycine ethylester melting at 67-8 and resembles the product of Example No. 5.

Example 12.In the same fashion 137.2 g. of p-phenetidine and 175 g. of p-chlorobenzoic acid chloride yield 202 g. of (p-chlorobenzoyl)-p-phenetidine which are recrystallized in absolute ethanol and melt at 188-9" C. By alkylation with chloroacetic ester or'a-chloropropionic there can be obtained the products described in Examples 2, 3 and 4.

(D) O-alkylation of N-(p-hydroxyphenyl) benzamides Example 13.109 g. of p-aminophenol are heated at 75 in 350 ml. of ethanol. There is introduced 61.3 g. of ethyl chloracetate and the mixture is refluxed for 3 hours. After cooling, the p-aminophenol chlorhydrate is filtered and the solution is concentrated to dryness under vacuum. The residue is dissolved in 1460 g. of 5% HCl. The impurities are extracted with ether and the solution is neutralized to a pH of 5.5 with 35% concentrated NaOH in the presence of ether. After distillation there is obtained 86.1 g. of crystalline residue. Recrystallization is carried out in 750 ml. of toluene to obtain 76 g. of N- (p-hydroxyphenyl)-glycine ethylester melting at 74-5".

39 g. of N-(p-hydroxyphenyl) glycine ethylester and 200 ml. of toluene are heated at 80. There is introduced 17.5 g. of p-chlorobenzoic' acid chloride dissolved in 50 ml. of toluene and the mixture is heated for an. hour. After cooling, the reaction mixture is filtered. The dry precipitate is mixed with 73 g. of 5% HCl in ml. of water. The precipitate is filtered and dried. By recrystallizing in toluene there is obtained 29.5 g. N-(p hydroxyphenyl) N- (p-chlorobenzoyl) glycine ethylester melting at 148-150.

Empirical formula: C H ClNO (MW 333.78):

Calculated (percent): C: 61.17,,IHZ 4.83, CI: 10.62,

N: 4.20 Found (percent):-C:- 61.06, H: 4.79, Cl: 10.51,

. Example -14.-In the same manner, 109 g. of p aminophenol are treated in 350 ml. of ethanol with"75.1 g. of ethyl u-chloropropionate withrefluxof 6 hours. There is obtained 74.5 g. ofN- (p-hydroxypheny1) alanine ethylester melting at 80-1. 41.8 g. of this product are benzoylated with 17.5 g. of p-chlorobenzoic acid chloride in toluene at 80 for 6 hours. The chlorhydrate is filtered "melting at 190-11 0. is filtered.

i d ih iiiiiie seliit ibn is cas'czaratai mana ers IiQQQVLQ WZ3-2. a... o. ..MN:(n-hydrQxynh ny -N(i o obenz oyl) alanine-ethylestermeltingat 106-107.

61.99, H: 5.18, Cl: 10.08, N: 4.01

Example 15.33.4 g. of N-(p-hydroxyphenyl)-N- (p-chlorobenzoyl) glycine ethylester, 264 g. of NaOH at %"are mixed at 20. There is added with stirring over /2- hour-41.6 g. of methyl sulphate. After several hours of reaction, the. pH falls to 6. There is added then 344 -g. of-5% NaOH and then the mixture is heated for' /z' hour to 60-65 until disappearance of the precipitate. The mixtureis treated 'with charcoal, filtered and neutralized with 25% HCl to pH 2. There is thus 24.1 v g. of N-(p-methoxyphenyl)-N-(p-chlorobenzoyl) glycine which is recrystallized in absolute ethanol to a melting point of 19l-2"C. the product being identical to that obtained byExample 1.

The p-ethoxy derivatives are obtained by alkylation with ethyI suI hate.

(E) Saponification-and decarboxylation of N-(p-alkoxyphenyl)-N-(p-chlorobenzoyl)-amino-malonic esters or acids Example 16. 2463 g. of p-anisidine in 500 ml. of toluene are heated at 60. There is introduced with stirring over A of an hour 241.5 g. of ethyl a-bromomalonateand the temperature is allowed to rise to 75 C. It is maintained at 80 C. .for 2 /2 hours. The bromohydrate of p-anisidine. is removed in the cold. The mixture is extracted with an aqueous 5% HCl solution which is then neutralized and concentrated to dryness under vacuum. There is obtained 287.6 g. of N-(p-methoxyphenyl)- aminoethyl malonate, melting at 5859 C. after recrystallization in toluene-benzine.

281.3 g. of the above compound are benzoylated in 600 ml. of toluene at 75 C. with 88.4 g. of p-chlorobenzoic acid chloride dissolved in 100 ml. of toluene. After filtering thechlorhydrate of the secondary amine extraction is carried out with an aqueous 5% solution HCl which is neutralized and concentrated under vacuum to dryness. The residue constituted by 220 g. of N-(pmethoxyphenyl) N (p -'chlorobenzoyl)-amino-ethyl malona te does not crystallize. It is dissolved in 360 m1. of ethanol then treated slowlywith stirring and cooling to 15-18 for 20 minutes'with 480 g. of an aqueous 10%- solutiont-of NaOH. The. solutionis then rapidly heated .around 60. After A of an hour N-(p-methoxyphehyD- N-(p-chlorobenzoyl) glycine crystallizes. The mixture is cooled, the pH is brought to 3.5 then 25.6 g. of product Recrystallization in80 ml. of absolute ethanol gives "21.6 got a product melting at 191192 of a product having an excellent quality which can be checked by thin layer chromatography.

Saponific ation of N-(p-alkoxyphenyl)-N-(p-chloro# benzoyl -aminoaceto-nitrile Example 17.There is formed a solution of 399.2 g. of sodium bisulphite in 650 ml. of water with agitation. At cooling there is introduced at 15-20 343.2 g. of an aqueous solution of formaldehyde at 35%. The mixture is then heated for a /2 hour to 35 C. The temperature is brought to 45 then there is rapidly introduced in the reaction mass 192.6 g. of p-anisidine. Heating is continued with stirring. At 60 the reaction begins. There is added 200 ml. of water then heating is continued and the temperature is maintained for an hour at A solution of 260.5 g. of potassium cyanide in 500 ml. of water is prepared which is introduced in the reaction mass at 70-75 with stirring. The crystalline sulfonic derivative disappears rapidly the N (p methoxyphenyl)-amino-acetonitrile forms a second liquid phase which is finely dispersed. After a /2 hour reaction time at 75 cooling is carried out and crystallization is begun at 45.

580.7 g. of amino nitrile are filtered which melt at 73 C. after recrystallizing in toluene.

162.2 g. of N-(p-methoxyphenyl) amino-acetonitrile are benzoylated at 2025 C. with 87.5 g. of p-chlorobenzoyl chloride dissolved in ml. of toluene. The mixture is agitated for 1 hour at ambient temperature then for 2 hours at 40 C. After filtering the chlorohydrate of the aminonitrile, the toluene is concentrated to dryness under vacuum. The residue, 135.5 g., consisting of N-(p-methoxyphenyl)-N-(p-chlorobenzoyl) amino acetonitrile does not crystallize.

77.0 g. of this product are treated with 350 ml. of 33% concentrated HCl with agitation for 1 hour at 70 C. After a reaction time of 10 minutes, a precipitate appears. The same is cooled at 20 C. then diluted with 1 litre of water. After crystallization in the refrigerator, 65.7 g. of N-(pmethoxyphenyD-N-(p-chlorobenzoyl) glycine amide are collected, this product melts at l60-l62 C. in the reaction mass 192.6 g. of p-anisidine. Heating is continued with stirring. At 60 the reaction begins. There is added 200 ml. of water then heating is continued and the temperature is maintained for an hour at 80. A solution of 260.5 g. of potassium cyanide in 500 ml. of water is prepared which is introduced in the reaction mass at 70-75 with rapid stirring. The crystalline sulfonic derivative disappears rapidly then N-(p-methoxyphenyl)-amino-acetonitrile forms a second liquid phase which is finely dispersed. After a /2 hour reaction time at 75 cooling is carried out and crystallization is begun at 45. After cooling and adjusting the pH at 3.5 there is filtered 25.6 g. of product melting at -191 C. Recrystallization in 80 ml. of absolute ethanol gives 1.6 g. of product melting at 191-192 which is a product of excellent quality a checked by thin layer chromatography.

The compositions constituting the invention have been made also with certain substituents other than those hereinbefore enumerated added to the phenyl and benzoyl portion of the nucleus, and, as determined by pharmacological evaluation, the toxicity and anti-inflammatory activity of the compositions so modified is not materially affected. Such additions to the molecular structure of the Inventive concept herein disclosed are, therefore, equivalents of the subject matter sought to be patented.

All the starting materials used in the synthesis described herein are known or are readily prepared in manner well known to those skilled in the art.

' Similarly it'i's possible to use starting materials having thereon the desired X, Y and R, substituents or else these may be introduced at a subsequent stage of the synthesis, which of the two alternatives is followed will bepend on availability of the compounds and other considerations evident to organic chemists.

f Other compounds according to the invention are tabulated in the following table with reference to their preferred mode of synthesis numbered as above:

positories, a liposoluble derivative such as a butyl ester GHQ-Q may be used.

The present compounds also can be injected in the form of, for example, a 10% solution of their sodium salts.

f They may also be administered as a syrup or as a suspension.

DOSAGE The effective dosage of the compounds of the invention I 1O depends upon the severity, the stage, and the individual characteristics of each case and will be determined by S C CHARACTERISTICS the attending physician. In the following examples of clin- The above named compound is Slightly coloumd and ical cases various dosages are indicated by way of exmelts at 192 C. (uncorrected) and is soluble in various ampleorganic solvents, alcohol, ether, ethyl acetate.

This compound has a maximum UV. absorption at A =2275 III/L, in alcoholic solution with Clinical observations of antalgic and anti-inflammatory properties m Antalgic properties which facilitates its identification and its dosage in unit g f cases Studied 20 dosage forms. s d 10 In the case of a-amino acid derivatives having more 4 than two carbon atoms there occurs optical isomerism and I 00 nconclusive 6 the product obtained by the total synthesis is racemic. The different activities Observed With these compounds It should be noted that many of these patients had not can be due partly to this fact. Isolation of one of the opb d d b treatment ith salicylatgg tical forms (dor 1-) leads to an increase of this activity.

PHARMACOLOGICAL ACTIVITY OF PREFERRED Ann'mflammamry efiects COMPOUND TOXICITY Number of cases 15 (1) Acute toxicity.(a) Orally in the rat the adminis- Disappearance, 8 tration of a single dose of 1 g. per kg. does not cause Improvement m mobulty 10 death. Administration must be repeated for 2 or 3 days Inconcluswe results 5 to Cause the death of certun auunals- The compound does not give arise to side effects. subcutaneously slugluuose 4 lug/kgcauses Where gastric problems arise they are eliminated by retinejzitiegrtlh of 50% of the animals within 24 hours after placing the f acid by its sodium Salt (2) Sub-acute toxicity-The daily chronic adminis- CONCLUSIONS tration of the compound for a month was etfected on male Wistar rats. With an oral dosage of 400 mg./kg./day no Favourable results have been obtamed by usmg. a mortality noted in animals posology of 600 mg. per day of active compound using With a subcutaneous injection at a dosage of 200 mg./ SIX 100 capsules taken two at a tune three tunes kg./day and 300 mg./kg./day the compound caused the death of no animals after a daily treatment carried out Preferably capsules are taken WM} alkahne t for three weeks. The antalgic effects appear very rapidly after taking Upon autopsy no macroscopic alteration of the different the and mamtam themselves for an lmpor' organs was detectable. Mice treated each day with 200 tam lapse of tune mg./kg. orally did not show any signs of intoxication for Inflammatory oedema ulsappears after a few days of 60 days. treatment.

The foregoing pharmacological results were confirmed ANTIINFLAMMATORY ACTIVITY clinically, representative clinical histories being as follows: This activity was tested by using the inhibition of A 15 year old female had Cephalic disturbances, Urine oedema to formaline and by comparing With known antiincontinency, personality troubles evolving from the age inflammatory compounds. Results were obtained on a of 7 with relapse at the age of 13 and for pains in the series of 10 rats: joints with chronic rheumatism attacks.

Increase in volume of the paw is at percen 0 Treatment Type of administration initial volume None 34.4 Compound of the invention, 173 mg./kg Single administration, orally 12.3 Compound of the invention, 131 mg./kg Single oral administration 19 Monophenyl butazone, 138 mg./kg Single administration, orally--. 22. 8 Ccrtisone, 10 mg./kg Three days intramuscularly 14. 8

ADMINISTRATION U on examination were noted:

p I The claimed compounds have been administered orally u z u k f h as capsules coated tablets or pills obtained by mixing the W1 Predommant ac 0 motor coor manon m t 6 active ingredient With the usual excipients. Generally the upper fuembem concentration of the active principle is of 100-200 mg. sphlllctfirlal and balance troubles and personallty per unit dosage form. troubles.

In certain cases of pre-existing gastric intolerance the (b) A thrltw syndrome: compound suitably may be used in its sodium salt-form. spontaneous pain occasioned by the joints, especially Where it is desired to use the active compounds as supthe shoulders, of the type periarthritis and scap- 19' ulohumeral with. irradiation in the 'nape'of the'neck and in the hands especially at night. inflammatory oedema. stiffening without lessening of active and passive mobility. Biological examination:

Antistreptolysine680 u. VS: 1 hr., 20 mins.-24 hours, 46 mins.

This patient was treated with three capsules of 300 mg./24 h. five days a week for two months together with viamin B. The pain was rapidly sedated in particular with respect to the arthritic syndrome and the joints became less stiff' and the inflammatory oedema disappeared. The choreo-athetosic condition improved. After two months of treatment the chronic rheumatismal condition and the neuro-muscular condition improved spectacularly.

A 50 yea old male complained of painful attacks of the sciatalgic type. Upon examination were noted signs of spondylarthritis of the ankylosis type which had gone on according to the patient for 25 years. Also n'oted was a total rigidity of the spine and ankylosis of the costovertebral joints and sacro-iliac-cyphosis together with periostosis of the iliac crests with diffuse osteoporosis. Also noted were pains in the left hip area with projection to the back side of the thigh. Similarly were noted lumbar pain projecting to the left thigh and aggavated by coughing and manual pressure. The refiexes and physical sensitivity were normal. The biological indicia noted were a normal hemogram of 17 ceto being 11.4 mg./24 hours. This patient was given 3 capsules of 300 mg./24 hours for six months. There was noted a progressive improvement of the painful symptoms, in particular in the lower limbs. No noteworthy modifications were noted in the spondylarthritic sydrome. However the sciatalgic syndromes were so improved that the patient was able to resume work.

A female of 65 complained of headaches, asthenia and pain in the joints. Upon examination there was noted a considerable plethora of polyarthritic rheumatism which had worsened over the years to a type of gout. The patient also complained of pain in the joints which were not managed by any steroides or sedatives. These pains were principally in the-shoulder, the nape of the neck and the hips. Functional troubles including stiffness and great diflicult in moving the head as well as the upper and lower limbs as well as acrodys'esthesia of the fingers.

X-rays showed a generalized arthrosis in particular in the shoulder, the hips and in the cervical column. Biological examination showed a normal hemogram and uric acid at 0.03 g./l. This patient was administered 600 mg./ 24 hours for three weeks and then 300 mg. for six weeks. At the end of this treatment the patient was able to freely move her head without any trapezian pain. Considerable improvement was noted in the active and passive movements of the upper and lower limbs in particular with respect to bending and rotation and since the acroparesthesia of the fingers had disappeared the patient was able to once again work around her home.

What is claimed is:

1. Composition having the formula:

where R is H, methyl, ethyl, phenyhbenzyl, o-tolyl,- cyclopenty'l, carboxy, sodium carboxy and carboethoxy;

wherein R is H, methyl, ethyl, phenyl, benzyl, o-tolyl, cyclopentyl, R is OH, or an alkali metal or an alkaline earth metal salts of the corresponding acid, X and Y are H, OH, alkoxy of up to 2 carbon atoms, alkyl of up to 2 carbon atoms, chloro, amino or nitro each X and Y being the same or diifere'nfl'as well as the -l and d isomeric forms and racemic mixtures thereof. 3. Composition of claim 1 having the formula X-GE-oH-COR,

wherein R1 iS H 01' CH3, R is OH or alkoxy of up'to 6 carbon'atomsyand X and Y are the same or different and may be OH, me-

thoxy, ethoxy, chloro, amino or nitro. 4. Composition according to claim 1 which. is N -(pethoxyphenyl)-N-(p-chlorobenzoyl)-glycine ethyl ester.

5. Composition according to claim 1, which is N-( pmethoxyphenyl)-N-(p-chlorobenzoyl)glycine. r

6. Composition according to claim 1, which is N-(pethoxyphenyl) -N-(p-chlorobenzoyl)-glycine. 7. Composition according to claim 1, which is N-(pmethoxyphenyl -N- (p-chlorobenzoyl) -alanine.

8. Composition according to claim 1, which is N-(p- Y methoxyphenyl) -N- (p-chlorob enzoyl glycine 'ethylester.

. 9. Composition according to claim 1, which is' N-%(pmethoxyphenyl)-N- (p-chlorobenzoyl)-alanine ethyl ester.

10. Composition according to claim 1, which is N+;(p-

is N-(p- 3,763,216 21 22 16. Composition according to claim 1, which is N-(p- LORRAINE H. WEINBERGER, Primary Examiner hydroxyphenyl)-N-(p-chlorobenzoyl)-a1anine ethyl ester.

-17. Composition according to claim 1, which is N-(p- THAXTON Asslstant Exammer ethoXyphenyD-N-(p-chlorobenzoy1)-glycine butyl ester. s CL References Cited 5 260-2472, R, 247.2 A, 332.2 A, 470, 471 R, 518 A, 518 UNITED STATES PATENTS 2154519, 558 D, 558 A, 559 A; 424248, 275, 309, 319,

3,484,481 12/1969 Obendorf et a1. 260-519 

